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O'Shaughnessy Dam is a 430-foot-high (131 m) concrete arch-gravity dam in Tuolumne County, California, United States.It impounds the Tuolumne River, forming the Hetch Hetchy Reservoir at the lower end of Hetch Hetchy Valley in Yosemite National Park, about 160 miles (260 km) east of San Francisco. [6]
The O'Shaughnessy Dam is near Yosemite's western boundary, but the long, narrow, fingerlike reservoir stretches eastward for about 8 miles (13 km). [ 2 ] Tueeulala Falls , 840 ft (260 m), is located on the north side of the valley.
The Hetch Hetchy to Lake Vernon Trail in Yosemite starts from the parking lot close to the O'Shaughnessy Dam at the Hetch Hetchy Reservoir, and goes to Lake Vernon through the Yosemite Wilderness. Staying overnight requires a wilderness permit which can be obtained at the Hetch Hetchy ranger station or reserved online.
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The construction of the O'Shaughnessy Dam (built 1915–1923) flooded the valley, creating the Hetch Hetchy Reservoir. In the late 1980s, in response to an initiative by the Reagan Administration, the national Sierra Club created a group dedicated to restoring Hetch Hetchy Valley in Yosemite National Park called the Hetch Hetchy Restoration ...
The Raker Act was an act of the United States Congress that permitted building of the O'Shaughnessy Dam and flooding of Hetch Hetchy Valley in Yosemite National Park, California. It is named for John E. Raker, its chief sponsor.
O'Shaughnessy Dam (California), the dam that creates the Hetch Hetchy reservoir in Yosemite National Park O'Shaughnessy Dam (Ohio) , near Columbus Topics referred to by the same term
Park visitors will be in awe of the park’s well-known waterfalls that are still flowing with gusto. Among them: Vernal Fall, Nevada Fall, Bridalveil Fall, Yosemite Falls, Sentinel Falls, Ribbon ...